const printPyramid = (height, ...options) => {
  // 打印金字塔的符号，如果未传入有默认值   
  const {
    symbol = '*',
    space = ' '
  } = Object.assign({}, ...options);
  for (let i = 1; i <= height; i++) {
    const spaces = space.repeat(height - i);
    const blocks = symbol.repeat(2 * i - 1);
    document.write(`${spaces}${blocks}${spaces}<br/>`);
  }
};
const height = 5; // 金字塔的高度   
printPyramid(height, {
  symbol: '@',
  space: '-'
});
